Fine-tune description of dry=

[MichaelChirico]

Just looking at the formals(style_text) I guessed dry=TRUE and was met with a cryptic error, but that ultimately traces back to {rlang}:

r-lib/rlang#1914

So I'm offering this small grammar fix as a consolation prize.

[github-actions]

This is how benchmark results would change (along with a 95% confidence interval in relative change) if f180740 is merged into main:

• ✔️cache_applying: 24.6ms -> 24.3ms [-2.45%, +0.42%]
• ✔️cache_recording: 319ms -> 322ms [-0.13%, +1.59%]
• ✔️without_cache: 795ms -> 791ms [-1.99%, +0.98%]

Further explanation regarding interpretation and methodology can be found in the documentation.